CN109278700B - Steel ball driving pre-tightening force limiting type safety belt retractor - Google Patents
Steel ball driving pre-tightening force limiting type safety belt retractor Download PDFInfo
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- CN109278700B CN109278700B CN201811477375.1A CN201811477375A CN109278700B CN 109278700 B CN109278700 B CN 109278700B CN 201811477375 A CN201811477375 A CN 201811477375A CN 109278700 B CN109278700 B CN 109278700B
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- 230000000670 limiting effect Effects 0.000 title claims abstract description 140
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 43
- 239000010959 steel Substances 0.000 title claims abstract description 43
- 230000007246 mechanism Effects 0.000 claims description 114
- 238000004804 winding Methods 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000020347 spindle assembly Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automotive Seat Belt Assembly (AREA)
Abstract
The invention relates to the technical field of automobile safety belt equipment, in particular to a steel ball driving pre-tightening force limiting type safety belt retractor, which comprises: the torsion bar is nested with the mandrel main body, the torsion bar is connected with the mandrel main body through the torsion head, the secondary force limiting ring is positioned between the mandrel main body and the ball wheel, a positioning groove is formed in the torsion head, a limiting protrusion is formed in the end face, in contact with the ball wheel, of the mandrel main body, the secondary force limiting ring is wound in a unidirectional mode along the limiting protrusion and the limiting groove, the torsion bar is stably connected with the mandrel main body through the torsion head, the positioning groove is formed in the torsion head, the secondary force limiting ring can penetrate through the positioning groove, stability of connection between the torsion bar and the mandrel main body during torsion is improved, the effect of torsion force generated by the secondary force limiting ring is enhanced, and the locking of the retractor is more stable.
Description
Technical Field
The invention relates to the technical field of automobile safety belt equipment, in particular to a steel ball driving pre-tightening force-limiting type safety belt retractor.
Background
The retractor with the emergency locking function is a core mechanism of an automobile safety belt, after the safety belt is tied, the retractor automatically tightens the safety belt, when the automobile is braked emergently or collides, an occupant can rapidly and violently stretch the safety belt, and the self-locking function of the retractor can instantly clamp the safety belt to enable the occupant to cling to the seat, so that the occupant is prevented from falling out of the automobile or being injured by collision.
The retractor mainly forms the secondary limit through torsion bar and secondary limit ring and dabber main part cooperation, and the torsion that the torsion bar born can be reduced to the secondary limit ring to guarantee that dabber mechanism operates steadily when the locking, however when the safety belt receives great exogenic action, the safety belt that receives exogenic action can produce great torsional force to dabber subassembly, and current dabber subassembly is to the great torsional force of restriction in time, and then causes the retractor to lock unstable, leads to the retractor to lock unstable.
Disclosure of Invention
The utility model aims at providing a steel ball drive pretension limit force formula safety belt retractor to the dabber subassembly that exists among the solution prior art is to the great torsional force of restriction in time, and then causes the coiler locking unstable, leads to the unstable technical problem of coiler locking.
The application provides a steel ball drive pretension limit power formula safety belt retractor, include: the mandrel mechanism, the coil spring mechanism, the pretension mechanism, the frame assembly and the mechanical end cover,
the mandrel mechanism is positioned in the frame assembly, the coil spring mechanism and the mechanical end cover are arranged on two sides of the frame assembly along the extending direction of the mandrel mechanism, the pre-tightening mechanism is positioned on the inner side of the frame assembly, the coil spring is used for winding a safety belt wound on the mandrel mechanism, the pre-tightening mechanism is used for pre-tightening the mandrel mechanism,
the mandrel mechanism comprises a shaft head, a ball wheel, a secondary force limiting ring, a torsion head, a torsion bar and a mandrel main body, wherein the shaft head is connected with the ball wheel in a nested way, the torsion bar is connected with the mandrel main body in a nested way, the torsion bar is connected with the shaft head through the torsion head, the secondary force limiting ring is positioned between the mandrel main body and the ball wheel, a limiting groove is arranged on the torsion head, a limiting bulge is arranged on the end surface of the mandrel main body, which is contacted with the ball wheel, the secondary force limiting ring is wound in a unidirectional way along the limiting bulge and the limiting groove,
the pre-tightening mechanism comprises a special-shaped guide pipe, steel balls and a cover body, wherein the special-shaped guide pipe extends to the inner side of the cover body and is fixedly installed, the ball wheels are arranged on the inner side of the cover body, the steel balls extend into the space between the cover body and the ball wheels along the special-shaped guide pipe, and the steel balls drive the ball wheels and the mandrel to pre-tighten the safety belt.
Further, the pre-tightening mechanism also comprises a supporting block,
one side of the supporting block is abutted against the cover body, and the other side of the supporting block is arc-shaped and abutted against the mandrel mechanism and used for limiting the mandrel mechanism radially.
Further, a positioning column is arranged on the supporting block, a positioning hole is formed in the cover body, or the positioning hole is formed in the supporting block, the positioning column is arranged on the cover body, and the positioning column can be inserted into the positioning hole and used for limiting the supporting block.
Further, a connecting block is arranged at one end, connected with the shaft head, of the torsion head, a connecting port is correspondingly arranged on the shaft head, and the connecting block can be inserted into the connecting port.
Further, the number of the connecting blocks is two, and the two connecting blocks are symmetrically arranged on two sides of the positioning groove.
Further, the limiting groove penetrates through the torsion head along the radial direction of the torsion head, openings at two ends of the limiting groove are unfolded towards two sides of the limiting groove, and the side wall of the edge of the opening is arc-shaped.
Further, the torsion head is made of steel, and the shaft head, the ball wheel, the torsion bar and the mandrel main body are made of aluminum.
Further, the ball wheel comprises a ball wheel main body, a connecting ring and a bushing,
the ball wheel main body and the connecting ring are of an integrated structure, and the bushing is arranged in the connecting ring.
Further, the ball wheel main body is of an annular structure, a plurality of spline grooves are uniformly formed in the circumferential direction of the inner circumferential surface of the ball wheel main body, and the ball wheel main body is connected with the shaft head through the spline grooves.
Further, one end of the connecting ring far away from the ball wheel main body is provided with a plurality of riveting interfaces, and a plurality of riveting ports are uniformly distributed along the circumference of the connecting ring and used for limiting the mandrel by inwards turning the edge of the connecting ring.
Compared with the prior art, the invention has the beneficial effects that:
the steel ball drive pretension limit power type safety belt retractor that this application provided includes: the safety belt winding device comprises a mandrel mechanism, a coil spring mechanism, a pre-tightening mechanism, a frame assembly and a mechanical end cover, wherein the mandrel mechanism is positioned inside the frame assembly, the mandrel mechanism is used for winding a safety belt, the coil spring mechanism and the mechanical end cover are arranged on two sides of the frame assembly along the extending direction of the mandrel mechanism, one end of the mandrel mechanism is connected with the coil spring mechanism, the coil spring mechanism is used for enabling the safety belt on the mandrel mechanism to generate tightening force, the safety belt is guaranteed to be always attached to a human body, and the other end of the mandrel mechanism is connected with the mechanical end cover. The pretension mechanism is positioned at the inner side of the frame assembly and is used for pretensioning the mandrel mechanism when an emergency occurs, so that the mandrel mechanism rotates to pull the safety belt back for pretension.
Specifically, dabber mechanism includes spindle nose, ball wheel, second grade limit force ring, torsion head, torsion bar and dabber main part, is provided with the spline on the lateral wall of spindle nose link, and the ball wheel also corresponds and is provided with the spline, makes the spindle nose can pass the ball wheel and with ball wheel nested connection, the torsion bar with dabber main part nested connection, the torsion bar is located the dabber main part, just the one end of torsion bar is connected with the dabber main part through the spline, and the other end of torsion bar is connected with the torsion head through the spline, and the torsion head is connected with the spindle nose link again, and the torsion head still is provided with the constant head tank with one side that the spindle nose is connected, and the constant head tank runs through the torsion head terminal surface, the dabber main part with be provided with spacing arch on the terminal surface that the ball wheel contacted, second grade limit force ring is followed spacing arch and spacing groove unidirectional winding.
The pretension mechanism comprises a special-shaped guide tube, steel balls and a cover body, wherein the special-shaped guide tube extends to the inner side of the cover body and is fixedly installed, the special-shaped guide tube is convenient to improve the compactness of the pretension mechanism, saves space, can be arranged according to space requirements, is convenient to use, the ball wheel is matched with a mandrel mechanism, the ball wheel is arranged on the inner side of the cover body, the mandrel mechanism and the ball wheel synchronously rotate, a plurality of steel balls extend into the cover body along the special-shaped guide tube and between the ball wheels, and the ball wheels are driven to rotate to drive the mandrel mechanism to rotate so as to pretension a safety belt. When an automobile encounters an emergency, the gas generating agent acts to push the steel balls to enter the cover body along the special-shaped guide tube, the steel balls are arranged in a changing mode along the inner side of the cover body and drive the ball wheel to drive the mandrel to rotate, the safety belt is pulled back to be pre-tightened rapidly, the structure is simple, and the pre-tightening efficiency is high.
According to the steel ball driving pre-tightening force-limiting type safety belt retractor, the torsion bar subjected to torsion force can be prevented from rotating through the torsion head between the torsion bar and the shaft head, and the torsion force borne by the torsion bar is reduced. The end face of the mandrel is provided with a force limiting ring, the secondary force limiting torsion head is provided with a limiting groove, the force limiting ring penetrates through the secondary force limiting torsion head to be connected with the end face of the mandrel, the force limiting ring can generate resistance with the end face friction of the mandrel, the friction force can buffer torsion force, and the force value of the secondary force limiting can be improved. Therefore, the coiler of the application ensures the stability of the mandrel assembly during locking, and has simple and compact structure and convenient production and processing.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Figure 1 is a schematic view of the overall structure of a retractor according to an embodiment of the present invention,
figure 2 is a schematic view illustrating the structural disassembly of a spindle mechanism of a retractor according to an embodiment of the present invention,
figure 3 is a schematic diagram of an assembly structure of a torsion bar and a torsion head of a retractor mandrel mechanism according to an embodiment of the present invention,
figure 4 is a schematic diagram of an assembly structure of a torsion head and a secondary force limiting ring of a mandrel mechanism of a retractor provided by an embodiment of the invention,
figure 5 is a schematic diagram of an assembly structure of a torsion head and a secondary force limiting ring of a mandrel mechanism of a retractor mandrel provided by an embodiment of the invention,
figure 6 is a schematic view of the position and structure of the torsion head and the spindle head of the spindle mechanism of the retractor in a first view angle according to an embodiment of the present invention,
figure 7 is a schematic view of the position and structure of the torsion head and the spindle head of the spindle mechanism of the retractor in a second view angle according to an embodiment of the present invention,
figure 8 is a schematic structural view of a retractor pretensioning mechanism according to an embodiment of the present invention,
FIG. 9 is a schematic structural view of a support block of a pretensioner mechanism of a retractor according to an embodiment of the present invention,
figure 10 is a schematic view of the structure of a ball wheel of a retractor mandrel mechanism provided by an embodiment of the present invention,
fig. 11 is a schematic diagram of the positions and structures of the mandrel mechanism and the steel ball of the retractor according to the embodiment of the present invention.
Reference numerals:
the device comprises a 1-mandrel mechanism, 11-shaft heads, 111-connecting ports, 12-ball wheels, 121-ball wheel bodies, 122-connecting rings, 123-shaft bushings, 124-rivet interfaces, 125-spline grooves, 13-second-stage force limiting rings, 14-torque heads, 141-limiting grooves, 142-connecting blocks, 15-torque rods, 16-mandrel bodies, 161-limiting protrusions, 162-first limiting protrusions, 163-second limiting protrusions, 164-third limiting protrusions, 165-fourth limiting protrusions, 166-fifth limiting protrusions, 167-sixth limiting protrusions, 2-coil spring mechanisms, 3-pretensioning mechanisms, 31-special-shaped guide tubes, 32-steel balls, 33-cover bodies, 34-supporting blocks, 341-limiting parts, 342-positioning columns, 4-frame assemblies and 5-mechanical end covers.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that, the described embodiments are some, but not all, embodiments of the invention.
The mechanisms of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediary, or communicating between the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
A steel ball-driven pretensioned force-limiting seatbelt retractor according to some embodiments of the present invention will be described below with reference to fig. 1 to 11.
Referring to fig. 1, the present application provides a steel ball driven pretensioned force limiting type seatbelt retractor, comprising: the mandrel mechanism 1, the coil spring mechanism 2, the pretensioning mechanism 3, the frame assembly 4 and the mechanical end cover 5, wherein the mandrel mechanism 1 is positioned in the frame assembly 4, the coil spring mechanism 2 and the mechanical end cover 5 are arranged on two sides of the frame assembly 4 along the extending direction of the mandrel mechanism 1, the pretensioning mechanism 3 is positioned on the inner side of the frame assembly 4, the coil spring is used for winding a safety belt wound on the mandrel mechanism 1, the pretensioning mechanism 3 is used for pretensioning the mandrel mechanism 1,
referring to fig. 2 to 5, the spindle mechanism 1 includes a spindle head 11, a ball wheel 12, a secondary force limiting ring 13, a torsion head 14, a torsion bar 15 and a spindle main body 16, the spindle head 11 is connected with the ball wheel 12 in a nested manner, the torsion bar 15 is connected with the spindle main body 16 in a nested manner, the torsion bar 15 is connected with the spindle head 11 through the torsion head 14, the secondary force limiting ring 13 is located between the spindle main body 16 and the ball wheel 12, a limit groove 141 is formed in the torsion head 14, a limit protrusion 161 is formed in the end face, in contact with the ball wheel 12, of the spindle main body 16, and the secondary force limiting ring 13 is wound unidirectionally along the limit protrusion 161 and the limit groove 141.
Referring to fig. 8 and 11, the pretensioning mechanism 3 includes a profiled guide tube 31, steel balls 32 and a cover 33, the profiled guide tube 31 extends to the inner side of the cover 33 and is fixedly installed, the ball wheel 12 is arranged at the inner side of the cover 33, a plurality of steel balls 32 are continuously wired and extend between the cover 33 and the ball wheel 12 along the profiled guide tube 31, and the ball wheel 12 and the mandrel are driven to pretension the safety belt.
The steel ball drive pretension limit power type safety belt retractor that this application provided includes: the safety belt winding device comprises a mandrel mechanism 1, a coil spring mechanism 2, a pre-tightening mechanism 3, a frame assembly 4 and a mechanical end cover 5, wherein the mandrel mechanism 1 is positioned inside the frame assembly 4, the mandrel mechanism 1 is used for winding a safety belt, the coil spring mechanism 2 and the mechanical end cover 5 are arranged on two sides of the frame assembly 4 along the extending direction of the mandrel mechanism 1, one end of the mandrel mechanism 1 is connected with the coil spring mechanism 2, the coil spring mechanism 2 is used for enabling the safety belt on the mandrel mechanism 1 to generate tightening force, the safety belt is guaranteed to be always attached to a human body, and the other end of the mandrel mechanism 1 is connected with the mechanical end cover 5. The pretensioning mechanism 3 is located inside the frame assembly 4 and is used for pretensioning the mandrel mechanism 1 when an emergency occurs, and the mandrel mechanism 1 is rotated to pull the safety belt back for pretensioning.
Specifically, the spindle mechanism 1 comprises a spindle head 11, a ball wheel 12, a secondary force limiting ring 13, a torsion head 14, a torsion bar 15 and a spindle main body 16, wherein a spline is arranged on the outer side wall of the connecting end of the spindle head 11, the ball wheel 12 is correspondingly provided with a spline, the spindle head 11 can penetrate through the ball wheel 12 and is connected with the ball wheel 12 in a nested manner, the torsion bar 15 is connected with the spindle main body 16 in a nested manner, the torsion bar 15 is positioned in the spindle main body 16, one end of the torsion bar 15 is connected with the spindle main body 16 through the spline, the other end of the torsion bar 15 is connected with the torsion head 14 through the spline, the torsion head 14 is connected with the connecting end of the spindle head 11, a limiting groove 141 is further formed in the side, which is connected with the spindle head 11, the limiting groove 141 penetrates through the end face of the torsion head 14, a limiting protrusion 161 is arranged on the end face, which is contacted with the ball wheel 12, of the secondary force limiting ring 13 is wound unidirectionally along the limiting protrusion 161 and the limiting groove 141.
More specifically, a first limiting protrusion 162, a second limiting protrusion 163, a third limiting protrusion 164, a fourth limiting protrusion 165, a fifth limiting protrusion 166 and a sixth limiting protrusion 167 are sequentially arranged on one side end surface of the mandrel main body 16 along the circumferential direction, the first limiting protrusion 162 and the fourth limiting protrusion 165 are symmetrically distributed, the second limiting protrusion 163 and the fifth limiting protrusion 166 are symmetrically distributed, the third limiting protrusion 164 and the sixth limiting protrusion 167 are symmetrically distributed, the second limiting ring 13 sequentially passes through the limiting groove 141 along the outer side surface of the third limiting protrusion 164, the inner side surface of the second limiting protrusion 163, the outer side surface of the first limiting protrusion 162, the outer side surface of the limiting groove 141, the outer side surface of the fourth limiting protrusion 165, the inner side surface of the fifth limiting protrusion 166 and the outer side surface of the sixth limiting protrusion 167, and the side surfaces of the first limiting protrusion 162, the second limiting protrusion 163, the third limiting protrusion 164, the fourth limiting protrusion 165, the fifth limiting protrusion 166 and the sixth limiting protrusion 167 can rub with the second limiting ring 13 to form a second limiting force, and the middle part of the second limiting force wire penetrates through the limiting groove 141, so that limiting of the second limiting ring 13 is beneficial to limiting the second limiting ring 13.
Preferably, in order to increase the contact area between the limiting projection 161 and the secondary force limiting ring 13 and increase the friction force, the first limiting projection 162 and the fourth limiting projection 165 are bar-shaped, the second limiting projection 163 and the fifth limiting projection 166 are cylindrical, and the third limiting projection 164 and the sixth limiting projection 167 are arc-shaped.
The pretension mechanism 3 comprises a special-shaped guide tube 31, steel balls 32 and a cover body 33, the special-shaped guide tube 31 extends to the inner side of the cover body 33 and is fixedly installed, the special-shaped guide tube 31 is convenient to improve the compactness of the pretension mechanism 3, space is saved, the pretension mechanism can be arranged according to space requirements, the pretension mechanism is convenient to use, the ball wheel 12 is matched with the mandrel mechanism 1, the ball wheel 12 is arranged on the inner side of the cover body 33, the mandrel mechanism 1 and the ball wheel 12 synchronously rotate, a plurality of steel balls 32 extend into the space between the cover body 33 and the ball wheel 12 along the special-shaped guide tube 31, the steel balls 32 drive the ball wheel 12 to rotate, and the mandrel mechanism 1 is driven to rotate so as to pretension a safety belt. When an automobile encounters an emergency, the gas generating agent acts to push the steel ball 32 to enter the cover body 33 along the special-shaped guide tube 31, the steel ball 32 moves along the inner side of the cover body 33 and drives the ball wheel 12 to drive the mandrel to rotate, the safety belt is quickly pulled back to be pre-tightened, the structure is simple, and the pre-tightening efficiency is high.
The coil spring mechanism 2 of the present application may be any coil spring mechanism 2 commonly used in a retractor in the prior art, and is not specifically limited herein.
The utility model provides a steel ball drive pretension limit formula safety belt retractor's torsion bar 15 and spindle nose 11 are connected through torsion head 14 stability, and be provided with spacing groove 141 on the torsion head 14, second grade limit force ring 13 can pass spacing groove 141, when using, spindle assembly's spindle nose 11 is by the locking back, the safety belt in the dabber continues to be released, the dabber pulls out with the safety belt and continues to rotate, torsion bar 15 one end is twisted along with the dabber rotation, and then make torsion bar 15 receive torsional force, because the one end dabber looks joint of torsion bar 15, and then carry out one-level limit force to the torsional force that torsion bar 15 received, the other end of torsion bar 15 is through second grade limit force torsion head 14 and spindle nose 11 looks joint, because spindle nose 11 is motionless, and then the torsional force that second grade limit force torsion head 14 received to torsion bar 15 has the second grade limit force, that is to say, the torsion bar 15 that second grade limit force torsion head 14 can prevent to receive torsional force rotates, the torsional force that second grade limit force torsion head 14 still can reduce the torsional force that torsion bar 15 bears. The end face of the mandrel is provided with a force limiting ring, the secondary force limiting torsion head 14 is provided with a limiting groove 141, the force limiting ring penetrates through the secondary force limiting torsion head 14 to be connected with the end face of the mandrel, the force limiting ring can generate resistance with the end face friction of the mandrel, the friction force can buffer the torsion force, and the friction force can improve the force value of the secondary force limiting.
The locking device ensures the stability of the mandrel assembly during locking, and is simple and compact in structure and convenient to produce and process.
In one embodiment of the present application, preferably, as shown in fig. 6 and 7, a connection block 142 is disposed at an end of the torque head 14 connected to the spindle head 11, a connection port 111 is correspondingly disposed on the spindle head 11, and the connection block 142 can be inserted into the connection port 111.
In this embodiment, in order to enhance the stability of the connection between the torque head 14 and the stub shaft 11, a connection block 142 is provided at the end of the torque head 14 to which the stub shaft 11 is connected, a connection port 111 is correspondingly provided at the stub shaft 11, the connecting block 142 is adapted to the connecting port 111, so that the connecting block 142 can be stably inserted into the connecting port 111, and the spindle nose 11 can drive the torsion head 14 and the torsion bar 15 to rotate.
Preferably, the outer wall surface of the torsion head 14 is also provided with splines in cooperation with the outer side wall of the connecting end of the stub shaft 11, so that the connected torsion head 14 and the head 11 can be stably connected with the ball wheel 12.
In one embodiment of the present application, preferably, as shown in fig. 6 and 7, the number of the connection blocks 142 is two, and the two connection blocks 142 are symmetrically disposed at both sides of the limit groove 141.
In this embodiment, to further improve the stability of the connection between the torque head 14 and the spindle head 11, two connection blocks 142 on the torque head 14 are provided, the two connection blocks 142 are symmetrically disposed on two sides of the limit slot 141, and the connection ports 111 are in one-to-one correspondence with the connection blocks 142.
In one embodiment of the present application, preferably, as shown in fig. 4, the limiting groove 141 penetrates the torsion head 14 along the radial direction of the torsion head 14, and openings at two ends of the limiting groove 141 are both unfolded towards two sides of the limiting groove 141, and the side walls of the edges of the openings are arc-shaped.
In this embodiment, since the force limiting ring and the openings at the two ends of the torsion head 14 are subjected to a larger force in the second-stage force limiting process, the openings at the two ends of the limit groove 141 are flared toward the two sides of the limit groove 141 to avoid the breakage of the force limiting ring, and the side walls of the edges of the opening are arc-shaped, so that the breakage of the force limiting ring can be effectively avoided.
In one embodiment of the present application, the torsion head 14 is preferably made of steel, and the spindle head 11, the ball wheel 12, the torsion bar 15 and the spindle body 16 are preferably made of aluminum.
In this embodiment, since the torsion head 14 receives a larger torsion force during the secondary force limiting process, in order to ensure that the torsion head 14 stably connects the torsion bar 15 and the spindle head 11 and has a limiting effect on the force limiting ring, the torsion head 14 is designed to be made of steel, the force limiting ring is also made of steel, and for other structures such as the spindle head 11, the ball wheel 12, the torsion bar 15 and the spindle body 16, aluminum materials can be used to reduce the overall mass of the retractor.
In one embodiment of the present application, preferably, referring to fig. 8 and 9, the pretensioning mechanism 3 further comprises a support block 34,
one side edge of the supporting block 34 abuts against the cover body 33, and the other side edge of the supporting block 34 is arc-shaped and abuts against the mandrel mechanism 1 to radially limit the mandrel mechanism 1.
In this embodiment, in order to prevent the mandrel mechanism 1 from moving radially during the pre-tightening process, and further prevent the mandrel mechanism 1 from deviating from the axis, a supporting block 34 is further disposed inside the cover 33 of the pre-tightening mechanism 3, and an end surface of the supporting block 34 is in a curved strip shape, specifically, one side edge of the supporting block 34 abuts against the cover 33, the other side edge of the supporting block 34 abuts against the mandrel mechanism 1 in an arc shape, and the supporting block 34 is located between the cover 33 and the frame assembly 4, and the cover 33 and the frame assembly 4 cooperate to fix the supporting block 34, so that the radial movement of the mandrel mechanism 1 can be limited, and the pre-tightening system is more stable.
Preferably, in order to improve the positioning performance of the connection between the supporting block 34 and the cover 33, a limiting part 341 is disposed at the connection between the supporting block 34 and the cover 33, a positioning groove is correspondingly disposed on the cover 33, and the limiting part 341 is adapted to the positioning groove, so as to prevent the supporting block 34 from moving and losing the radial limiting effect on the spindle mechanism 1.
In one embodiment of the present application, preferably, referring to fig. 9, a positioning post 342 is provided on the supporting block 34, a positioning hole is provided on the cover 33, or a positioning hole is provided on the supporting block 34, a positioning post 342 is provided on the cover 33, and the positioning post 342 can be inserted into the positioning hole for limiting the supporting block 34.
In this embodiment, in order to further improve the fixing and limiting effect on the supporting block 34, so that the fixing and limiting effect on the spindle mechanism 1 is better, a positioning column 342 is provided on the supporting block 34, a positioning hole is provided on the cover 33, and the positioning effect on the supporting block 34 is achieved through the cooperation of the positioning column 342 and the positioning hole. Of course, the supporting block 34 may be provided with a positioning hole, and the cover 33 may be provided with a positioning post 342, which is the same principle.
In one embodiment of the present application, preferably, as shown in fig. 2, 10 and 11, the ball wheel 12 includes a ball wheel body 121, a connection ring 122 and a bushing 123,
the ball wheel body 121 and the connection ring 122 are of an integral structure, and the bushing 123 is disposed inside the connection ring 122.
In this embodiment, the ball wheel body 121 and the connection ring 122 are designed as an integral structure, and welding of the ball wheel body 121 and the connection ring 122 is not required, so that the process is simplified and the strength of the ball wheel 12 is enhanced.
In one embodiment of the present application, preferably, as shown in fig. 10 and 11, the ball wheel body 121 has an annular structure, and a plurality of spline grooves 125 are uniformly provided along the circumferential direction of the inner circumferential surface of the ball wheel body 121, and the ball wheel body 121 is connected with the spindle head 11 through the spline grooves 125.
In this embodiment, a plurality of spline grooves 125 are provided on the inner circumferential surface of the ball wheel body 121, and splines are provided on the outer wall of the spindle head 11 in a matching manner, so that axial connection of the ball wheel body 121 and the spindle head 11 can be achieved by matching the splines with the spline grooves 125.
In addition, a plurality of riveting points are further arranged at the joint of the shaft head 11 and the ball wheel main body 121, and the shaft head 11 and the ball wheel main body 121 are further fixedly connected through riveting.
In one embodiment of the present application, preferably, as shown in fig. 11, one end of the connecting ring 122 away from the ball wheel body 121 is provided with a plurality of rivet ports 124, and the rivet ports 124 are uniformly distributed along the circumference of the connecting ring 122, so that the edge of the connecting ring 122 is turned inwards to limit the mandrel.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some or all of the technical features may be replaced with other technical solutions, which do not depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A steel ball driven pretension force limiting seatbelt retractor comprising: the mandrel mechanism, the coil spring mechanism, the pretension mechanism, the frame assembly and the mechanical end cover,
the mandrel mechanism is positioned in the frame assembly, the coil spring mechanism and the mechanical end cover are arranged on two sides of the frame assembly along the extending direction of the mandrel mechanism, the pre-tightening mechanism is positioned on the inner side of the frame assembly, the coil spring is used for winding a safety belt wound on the mandrel mechanism, the pre-tightening mechanism is used for pre-tightening the mandrel mechanism,
the mandrel mechanism comprises a shaft head, a ball wheel, a secondary force limiting ring, a torsion head, a torsion bar and a mandrel main body, wherein the shaft head is connected with the ball wheel in a nested way, the torsion bar is connected with the mandrel main body in a nested way, the torsion bar is connected with the shaft head through the torsion head, the secondary force limiting ring is positioned between the mandrel main body and the ball wheel, a limiting groove is arranged on the torsion head, a limiting bulge is arranged on the end surface of the mandrel main body, which is contacted with the ball wheel, the secondary force limiting ring is wound in a unidirectional way along the limiting bulge and the limiting groove,
the pre-tightening mechanism comprises a special-shaped guide pipe, steel balls and a cover body, wherein the special-shaped guide pipe extends to the inner side of the cover body and is fixedly installed, the ball wheels are arranged on the inner side of the cover body, a plurality of steel balls extend between the cover body and the ball wheels along the special-shaped guide pipe, and the steel balls drive the ball wheels and the mandrel to pre-tighten the safety belt;
a connecting block is arranged at one end of the torsion head, which is connected with the shaft head, a connecting port is correspondingly arranged on the shaft head, and the connecting block can be inserted into the connecting port;
the number of the connecting blocks is two, and the two connecting blocks are symmetrically arranged on two sides of the limiting groove;
the limiting groove penetrates through the torsion head in the radial direction of the torsion head, openings at two ends of the limiting groove are unfolded towards two sides of the limiting groove, and the side wall of the edge of the opening is arc-shaped.
2. The steel ball driven pretensioning force limiting seatbelt retractor of claim 1, wherein the pretensioning mechanism further comprises a supporting block,
one side of the supporting block is abutted against the cover body, and the other side of the supporting block is arc-shaped and abutted against the mandrel mechanism and used for limiting the mandrel mechanism radially.
3. The steel ball driven pretension force limiting type safety belt retractor according to claim 2, wherein a positioning column is arranged on the supporting block, a positioning hole is arranged on the cover body, or the positioning hole is arranged on the supporting block, the positioning column is arranged on the cover body, and the positioning column can be inserted into the positioning hole for limiting the supporting block.
4. The steel ball driven pretensioned force limiting seatbelt retractor of claim 1, wherein the torsion head is steel, and the spindle head, the ball wheel, the torsion bar and the spindle body are aluminum.
5. The steel ball driven pretensioned force limiting seatbelt retractor of claim 1, wherein the ball wheel includes a ball wheel body, a connecting ring and a bushing,
the ball wheel main body and the connecting ring are of an integrated structure, and the bushing is arranged in the connecting ring.
6. The steel ball driven pretension force limiting seatbelt retractor of claim 5, wherein the ball wheel body has a ring-shaped structure, and a plurality of spline grooves are uniformly provided along a circumferential direction of an inner circumferential surface of the ball wheel body, and the ball wheel body is connected with the spindle head through the spline grooves.
7. The steel ball driven pretension force limiting type safety belt retractor according to claim 5, wherein a plurality of riveting ports are formed in one end, far away from the ball wheel main body, of the connecting ring, and the riveting ports are uniformly distributed along the circumferential direction of the connecting ring and used for limiting the mandrel by inwards turning the edge of the connecting ring.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811477375.1A CN109278700B (en) | 2018-12-04 | 2018-12-04 | Steel ball driving pre-tightening force limiting type safety belt retractor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811477375.1A CN109278700B (en) | 2018-12-04 | 2018-12-04 | Steel ball driving pre-tightening force limiting type safety belt retractor |
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| CN109278700A CN109278700A (en) | 2019-01-29 |
| CN109278700B true CN109278700B (en) | 2024-04-16 |
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| CN201811477375.1A Active CN109278700B (en) | 2018-12-04 | 2018-12-04 | Steel ball driving pre-tightening force limiting type safety belt retractor |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110316147B (en) * | 2019-07-17 | 2021-04-23 | 重庆光大产业有限公司 | Pre-tightening force-limiting type retractor capable of synchronously rotating for positioning |
| CN111674353B (en) * | 2020-06-23 | 2024-05-03 | 浙江松原汽车安全系统股份有限公司 | Force limiting type mandrel and coiler |
| CN113183914B (en) * | 2021-04-06 | 2022-04-01 | 重庆光大产业有限公司 | Reliable coiler is steady and just terminates to limit for force |
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| US20100176236A1 (en) * | 2009-01-09 | 2010-07-15 | Autoliv Asp, Inc. | High performance tightener |
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| DE102004007824A1 (en) * | 2004-02-18 | 2005-09-08 | Autoliv Development Ab | Seat belt tightener for a motor vehicle's seat belt has a seat-belt roll-up device and a tightener drive mechanism to link to a seat belt spindle on the roll-up device |
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